The Sony Pictures site itself contains almost entirely information about new movies, but this link will take you to a tour of Columbia Pictures, which Sony owns. Choose individual films for more goodies, including photos and film clips.

A collection of classic videos is available from Universal, though they make them hard to find, since there isn’t a separate “classics” category. Click on “Browse by Title.” You can also find soundtracks from some older films. The site was somewhat slow-loading last time we visited.